We Are Ophthalmology LTD We Care About Your Health

Over the years, Ophthalmology LTD's name has become associated with the highest quality of comprehensive medical and surgical eye care. Highly trained ophthalmologists Bryan Hammer, Eric Thomas, Dustin Dierks, Ryan Geraets, Michael Eide, Elizabeth Atchison, Elise In’t Veld, Karen Dickes, and Andrea Bordewyk, as well as experienced optometrists Andrea McCann, Emily Walters, and Tyler Vermeer combine their considerable expertise to give each and every patient the best possible care. Ophthalmology LTD delivers treatment for cataracts, glaucoma, diabetic eye disease, as well as cornea transplants, oculoplastic surgery, retina surgery, vitreoretinal surgery, and pediatric eye care in Sioux Falls.

The Region’s Most Trusted, Experienced Eye Surgeons

Ophthalmology LTD brings the finest eye specialists in South Dakota to satellite offices in the tri-state area: Luverne, Pipestone, Worthington and Windom in Minnesota, Rock Valley, Sibley, and Sioux Center in Iowa, as well as Dell Rapids, Madison, Mitchell, Watertown, and Yankton in South Dakota.


In 1968, Ophthalmology LTD revolutionized eye care by taking a comprehensive approach, bringing patients a full range of vision specialties under one roof. Today, eye care teams across the nation are now mimicking the strategy we have spent more than 50 years perfecting. It is because of this experience and our genuine dedication to our patients that our team is widely considered the finest, most comprehensive group of sub-specialty eye surgeons in the tri-state Siouxland area.

Our Services

Our ophthalmologists have expertise in a wide range of specialties and work as a team to meet your eye care needs.


Not only is cataract treatment the most frequently performed surgery in the United States, it is also one of the most successful. More than 99% of patients who undergo cataract removal rank their vision as significantly improved. Drs. Hammer, Dierks, Eide, In't Veld, West, and Dickes perform this highly effective procedure.

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Early detection and treatment is the key to preventing vision loss with Glaucoma. More than three million Americans have glaucoma, but only half are actually aware that this "silent thief" is slowly and without warning stealing away their vision, sometimes without any noticeable symptoms. Drs. In't Veld and Dickes at Ophthalmology LTD specializes in the diagnosis and treatment of glaucoma.

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Children should have a yearly comprehensive eye exam along with their parents. Many vision problems can be detected early and treated before they become detrimental to a child's development, learning abilities, and every day function. Dr. West of Ophthalmology LTD has 22 years of experience in the evaluation and treatment of children's vision.

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The retina functions much like the film in a camera, and when film is damaged, so is the picture. Our retinal specialists Drs. Geraets, Thomas, and Atchison  offer comprehensive retinal exams and treatment to protect against diseases such as diabetic retinopathy that can damage your retina and vision.

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If a window pane is distorted or marred by imperfections, it is difficult to see out through it clearly. Your cornea is your eye’s window. To keep it clear or to restore it to its proper state, Dr. Eide of Ophthalmology LTD uses his specialty training in corneal diseases to treat dry eye, keratoconus, and other conditions that can cause corneal imperfections.

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When your eyelids, eye sockets, or tear ducts malfunction, or a tumor threatens your vision, Ophthalmology LTD oculoplastic surgeon Dr. Hammer can help. Specializing in procedures that restore clear vision as well as a more youthful appearance, Dr. Hammer treats and manages a wide variety of ocular conditions.

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We are a team of passionate professionals with
caring for patients in South Dakota, Minnesota, & Iowa.

Have a look around, then call, request an appointment online, or come by to learn more about how our team of eye experts can help you and your family.

  • Dan H.
    Excellent service! Thank you.🙂
  • Lynda J.
    Al was very pleased with the service he received and I was as well Lynda Johnson
  • Mike W.
    Very thorough and efficient. Highly skilled surgeon and lovely to deal with.
  • Gene s.
    Everyone was great.
  • Genola H.
    Everyone was friendly and professional. Dr Walters is so kind and caring. Great experience!
  • Mary R.
    I had such great care and treatment for my eyes with Dr. Emily Walters and her staff. I appreciate all the time they took with me and, they listened to me. We need to recognize excellence in service which they... read more
  • Raymond C.
    A very comfortable, personalized and informative visit! Dr. Walter's and entire staff are the best.
  • Mary M.
    Dr. Hammer and his team are the best of the best. I felt so welcomed and comforted through the entire process. Both of my procedures have gone flawlessly with quick recovery. Dr. Hammer does a great job! I highly recommend... read more
  • Jan L.
    Everyone is so friendly and efficient. Very little waiting time.
  • Janice P.
    Not much to say, he's in the exam room maybe 4 minutes. I would like him to talk to me about the future of my eyesight and give me some hope.
  • Jo W.
    Everyone I encountered was efficient and kind.
  • Doug R.
    Appointment went very well, everyone was very professional and knowledgeable
  • Kat M.
    Very friendly n most polite people I’ve ever meet.
  • Kevin K.
    Great experience. The entire team was professional and knowledgeable. I highly recommend Opthalmolgy LTD.
  • Cindy S.
    My Dad Said Don't Give Up On Doctor In't Veld! Her Videos About Being A Pirate & Learning From Watching How She Does Cataract Surgery Done Like A Pirate ARRRRRR🦜! Ophthalmology LTD!Both My Frank & Kodi Stuffed Squirrel Says We... read more
  • Patricia K.
    Was very satisfied with the entire visit ..very friendly, professional staff...... Dr. Hammer, as usual, was very kind...thorough......explained to my uunderstanding.....and reassured me on all accounts....
  • Danelle H.
  • Guadalupe L.
    Dr. Walters is a great doctor to my husband and I and we trust her. Thank you for being a good friend too. 😍
  • Martin D.
    Dr. McCann is very personable and professional. It was a very positive experience establishing care with Dr. McCann!
  • Mc E.
    Where would I be without Ophthalmology LTD and if Dr R Geraets didn’t work there? Probably either partially blind or going fully blind because of my Macular Degeneration! I’m grateful and trust him! Thank you Dr Geraets for your steady... read more
  • Sue C.
    Dr. Thomas was great.
  • Terry H.
    Dr. Andrea Bordewyk has always been very professional and concerned about the outcome of my procedures. She is a pleasure to work with and I highly recommend her.
  • Mary A.
    Very pleasant experience, friendly staff from start to finish, great to have Dr.Thomas take care of me. Thank you to all-a very efficient clinic!
  • tom r.
    My vision is much improved after laser procedure performed by doctor Hammer. Treatment was extremely easy and pain free
  • Patsy S.
    Always seen quickly and kindly. All my questions answered.
  • Tammy V.
    Look no further! Dr Walters was fantastic! Her and the staff were so caring and thorough and so conscious of my migraines. This is the first time I have had an eye appointment and not gotten a migraine after! Dr... read more
  • Debbie R.
    Dr. Thomas is very kind, knowledgeable, and has helped me with two different retinal issues. I highly recommend him. His whole staff is friendly, proficient and knowledgeable in their expertise from reception to the patient care.... read more
  • Greg J.
    Dr Emily Walters and staff provided excellent service. It's really comforting to hand your eye care to people that give undivided attention to your concerns. Thank you!
  • Sheri H.
    Dr. Emily Walters a great Doctor & here staff
  • Julie B.
    Thank you, Emily Walters, for excellent care. I always have a good experience at Ophthalmology, Ltd!
  • Barb W.
    My husband and I have had some “unique” vision problems recently! Dr Walters has patiently, professionally, and honestly given us excellent care and treatment! We would highly recommend Dr Walters and Ophthalmology LTD!
  • david w.
    It always amazes me on their efficiency and the good people they hire especially Dr McCann she's very good and her profession
  • Brady S.
    Had an acute episode of flashing lights in one eye. They got me in ASAP. Professional staff. Dr. In’t Velt provided excellent care and an explanation of what was happening. 5 star care!
  • Sheryl K.
    Very professional and caring - I would definitely recommend Dr Emily Walter
  • Dennis K.
  • Denise W.
    Wonderful Doctors and staff
  • Patrick O.
    Everyone was professional and polite. Very much on time. Very detailed in procedures and instructions
  • Chuck
    The staff at Opthamology LTD are very friendly, helpful, and professional. Dr. Atchison makes me feel very at ease. She explains everything very thoroughly, and since my surgery went well, she obviously knows her stuff and has very steady hands.... read more
  • Brenda S.
    The staff at ophthalmology Limited or always professional and well qualified. When I lost the vision in my right eye that was the first place I wanted to go. They checked it out and told me it would clear up... read more
  • Denise W.
    retinopathy treatment and cataract treatment8
  • Scott A.
    The entire visit was a great experience. The nurses were friendly, knowledgeable, and helpful. Dr. Thomas spent the full time needed to hear and answer my questions. I left comfortably assured my eyes were in great hands.
  • Kathy J.
    Josh and Dr Walters were friendly, very knowledgeable and kept me informed if everything they were doing. Great experience!
  • Zainab H.
    Thankful to Dr. Walters for her caring ! Dr. Walters is smart and professional Opthamologist . I do trust her diagnosis and treatment. I highly recommend her for friends and family. Staff is friendly and helpful! Appreciate it !
  • Stephen J.
    I was able to get in the same day to get checked for a possible detached retina. They had me there in an hour and fully checked and on my way less than an hour later. Good attention to detail... read more
  • Bruce K.
    As always, great care
  • Trent D.
    The staff was very friendly and competent. They made me feel relaxed. The surgery was successful. Dr. Eide is an excellent doctor.
  • Elaine K.
    The entire staff is amazing.
  • Paul B.
    Knowledgeable and kind staff. I appreciated the expertise and communication given to me by Dr. Atchison as she reviewed my history and imaging. I recommend Ophthalmology LTD for your eye needs
  • Catherine C.
    I have actually enjoyed my experience so far. I am pre-surgical however, based on my initial consult for surgery, I am actually looking forward to having my cataracts removed. From my point of first contact with Hillary at the front... read more
  • Sonja C.
    Was pleased to see Dr. Dierks after 10 years and glad to find out it was nothing too much to worry about. Picked up the eye drops he recommended for dry eyes on the way home. Have used them twice... read more